MD5 hashing in Android

Question

I have a simple android client which needs to  talk  to a simple C  HTTP listener  I want to provide a basic level of authentication by passing username password in POST requests   MD5 hashing is trivial in C  and provides enough security for my needs but I can t seem to find how to do this at the android end   EDIT  Just to address the concerns raised about MD5 weakness - the C  server runs on the PCs of the users of my android client  In many cases  they ll be accessing the server using wi-fi on their own LANs but  at their own risk  they may choose to access it from the internet  Also the service on the server needs to use pass-through for the MD5 to a 3rd party application I have no control over

User · Answer

The androidsnippets com code does not work reliably because 0 s seem to be cut out of the resulting hash   A better implementation is here    public static String MD5 Hash String s        MessageDigest m   null       try               m   MessageDigest getInstance  MD5          catch  NoSuchAlgorithmException e                e printStackTrace               m update s getBytes   0 s length         String hash   new BigInteger 1  m digest    toString 16       return hash

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this is working perfectly for me  I used this to get MD5 on LIST Array then convert it to JSON object   but if you only need to apply it on your data  type format  replace  JsonObject  with yours   Especially if you have a mismatch with python MD5 implementation use this   private static String md5 List lt AccelerationSensor gt  sensor         Gson gson  new Gson        byte   JsonObject   new byte 0       try           JsonObject   gson toJson sensor  getBytes  UTF-8          catch  UnsupportedEncodingException e            e printStackTrace               MessageDigest m   null       try           m   MessageDigest getInstance  MD5          catch  NoSuchAlgorithmException e            e printStackTrace               byte   thedigest   m digest JsonObject       String hash   String format   032x   new BigInteger 1  thedigest        return hash

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Here is Kotlin version from  Andranik answer  We need to change getBytes to toByteArray  don t need to add charset UTF-8 because the default charset of toByteArray is UTF-8  and cast array i  to integer  fun String md5    String        try           val md   MessageDigest getInstance  MD5           val array   md digest this toByteArray            val sb   StringBuffer           for  i in array indices                sb append Integer toHexString array i  toInt   and 0xFF or 0x100  substring 1  3                     return sb toString         catch  e  java security NoSuchAlgorithmException          catch  ex  UnsupportedEncodingException              return null     Hope it help

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The provided solutions for the Scala language  a little shorter    def getMd5 content  Array Byte         try           val md   MessageDigest getInstance  MD5           val bytes   md digest content          bytes map b   gt  Integer toHexString  b   0x100    0x100   mkString       catch           case ex  Throwable   gt  null

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This is a slight variation of Andranik and Den Delimarsky answers above  but its a bit more concise and doesn t require any bitwise logic  Instead it uses the built-in String format method to convert the bytes to two character hexadecimal strings  doesn t strip 0 s   Normally I would just comment on their answers  but I don t have the reputation to do so   public static String md5 String input        try           MessageDigest md   MessageDigest getInstance  MD5             StringBuilder hexString   new StringBuilder            for  byte digestByte   md digest input getBytes                 hexString append String format   02X   digestByte             return hexString toString          catch  NoSuchAlgorithmException e            e printStackTrace            return null            If you d like to return a lower case string instead  then just change  02X to  02x   Edit  Using BigInteger like with wzbozon s answer  you can make the answer even more concise    public static String md5 String input        try           MessageDigest md   MessageDigest getInstance  MD5            BigInteger md5Data   new BigInteger 1  md digest input getBytes              return String Format   032X   md5Data         catch  NoSuchAlgorithmException e            e printStackTrace            return null

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I have made a simple Library in Kotlin   Add at Root build gradle  allprojects           repositories                               maven   url  https   jitpack io                      at App build gradle  implementation  com github 1AboveAll Hasher -SNAPSHOT    Usage  In Kotlin   val ob   Hasher     Then Use hash   method  ob hash  String You Want To Encode  Hasher MD5   ob hash  String You Want To Encode  Hasher SHA 1    It will return MD5 and SHA-1 Respectively   More about the Library  https   github com ihimanshurawat Hasher

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In our MVC application we generate for long param  using System Security Cryptography  using System Text              public static string getMD5 long id                   convert         string result    id   long MaxValue  ToString  X      -ANY-TEXT           using  MD5 md5Hash   MD5 Create                             Convert the input string to a byte array and compute the hash               byte   data   md5Hash ComputeHash Encoding UTF8 GetBytes result                    Create a new Stringbuilder to collect the bytes and create a string              StringBuilder sBuilder   new StringBuilder                for  int i   0  i  lt  data Length  i                    sBuilder Append data i  ToString  x2                     Return the hexadecimal string               result   sBuilder ToString   ToUpper                       return result          and same in Android application  thenk helps Andranik    import java security MessageDigest  import java security NoSuchAlgorithmException      public String getIdHash long id       String hash   null      long intId   id   Long MAX VALUE      String md5   String format   X-ANY-TEXT   intId       try           MessageDigest md   java security MessageDigest getInstance  MD5            byte   arr   md digest md5 getBytes             StringBuffer sb   new StringBuffer            for  int i   0  i  lt  arr length    i              sb append Integer toHexString  arr i   amp  0xFF    0x100  substring 1 3             hash   sb toString          catch  NoSuchAlgorithmException e            Log e  MD5   e getMessage                return hash toUpperCase

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MD5 is a bit old  SHA-1 is a better algorithm  there is a example here    Also as they note in that post  Java handles this on it s own  no Android specific code

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Useful Kotlin Extension Function Example fun String toMD5    String       val bytes   MessageDigest getInstance  quot MD5 quot   digest this toByteArray        return bytes toHex      fun ByteArray toHex    String       return joinToString  quot  quot      quot  02x quot  format it

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A solution above using DigestUtils didn t work for me  In my version of Apache commons  the latest one for 2013  there is no such class    I found another solution here in one blog  It works perfect and doesn t need Apache commons  It looks a little shorter than the code in accepted answer above    public static String getMd5Hash String input        try           MessageDigest md   MessageDigest getInstance  MD5            byte   messageDigest   md digest input getBytes             BigInteger number   new BigInteger 1  messageDigest           String md5   number toString 16            while  md5 length    lt  32              md5    0    md5           return md5        catch  NoSuchAlgorithmException e            Log e  MD5   e getLocalizedMessage             return null            You will need these imports    import java math BigInteger  import java security MessageDigest  import java security NoSuchAlgorithmException

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Here is an implementation you can use  updated to use more up to date Java conventions  - for each loop  StringBuilder instead of StringBuffer    public static String md5 final String s        final String MD5    MD5       try              Create MD5 Hash         MessageDigest digest   java security MessageDigest                  getInstance MD5           digest update s getBytes             byte messageDigest     digest digest                Create Hex String         StringBuilder hexString   new StringBuilder            for  byte aMessageDigest   messageDigest                String h   Integer toHexString 0xFF  amp  aMessageDigest               while  h length    lt  2                  h    0    h              hexString append h                     return hexString toString           catch  NoSuchAlgorithmException e            e printStackTrace              return         Although it is not recommended for systems that involve even the basic level of security  MD5 is considered broken and can be easily exploited   it is sometimes enough for basic tasks

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If using Apache Commons Codec is an option  then this would be a shorter implementation   String md5Hex   new String Hex encodeHex DigestUtils md5 data       Or SHA   String shaHex  new String Hex encodeHex DigestUtils sha  textToHash        Source for above   Please follow the link and upvote his solution to award the correct person     Maven repo link  https   mvnrepository com artifact commons-codec commons-codec    Current Maven dependency  as of 6 July 2016     lt  -- https   mvnrepository com artifact commons-codec commons-codec -- gt   lt dependency gt       lt groupId gt commons-codec lt  groupId gt       lt artifactId gt commons-codec lt  artifactId gt       lt version gt 1 10 lt  version gt   lt  dependency gt

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The accepted answer didn t work for me in Android 2 2  I don t know why  but it was  eating  some of my zeros  0     Apache commons also didn t work on Android 2 2  because it uses methods that are supported only starting from Android 2 3 x  Also  if you want to just MD5 a string  Apache commons is too complex for that  Why one should keep a whole library to use just a small function from it     Finally I found the following code snippet here which worked perfectly for me  I hope it will be useful for someone     public String MD5 String md5       try           java security MessageDigest md   java security MessageDigest getInstance  MD5            byte   array   md digest md5 getBytes  UTF-8             StringBuffer sb   new StringBuffer            for  int i   0  i  lt  array length    i              sb append Integer toHexString  array i   amp  0xFF    0x100  substring 1 3                     return sb toString          catch  java security NoSuchAlgorithmException e          catch UnsupportedEncodingException ex             return null

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Please use SHA-512  MD5 is insecure  public static String getSHA512SecurePassword String passwordToHash        String generatedPassword   null      try           MessageDigest md   MessageDigest getInstance  SHA-512            md update  everybreathyoutake  getBytes             byte   bytes   md digest passwordToHash getBytes             StringBuilder sb   new StringBuilder            for  int i   0  i  lt  bytes length  i                  sb append Integer toString  bytes i   amp  0xff    0x100  16  substring 1                      generatedPassword   sb toString          catch  NoSuchAlgorithmException e            e printStackTrace              return generatedPassword

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i have used below method to give me md5 by passing string for which you want to get md5    public static String getMd5Key String password               String password    12131123984335            try               MessageDigest md   MessageDigest getInstance  MD5                md update password getBytes                  byte byteData     md digest                   convert the byte to hex format method 1             StringBuffer sb   new StringBuffer                for  int i   0  i  lt  byteData length  i                      sb append Integer toString  byteData i   amp  0xff    0x100  16  substring 1                               System out println  Digest in hex format        sb toString                    convert the byte to hex format method 2             StringBuffer hexString   new StringBuffer                for  int i   0  i  lt  byteData length  i                      String hex   Integer toHexString 0xff  amp  byteData i                    if  hex length      1  hexString append  0                    hexString append hex                             System out println  Digest in hex format        hexString toString                  return hexString toString               catch  Exception e                   TODO  handle exception                    return

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Far too wasteful toHex   conversion prevails in other suggestions  really    private static final char   HEX ARRAY    0123456789ABCDEF  toCharArray     public static String md5string String s        return toHex md5plain s       public static byte   md5plain String s        final String MD5    MD5       try              Create MD5 Hash         MessageDigest digest   java security MessageDigest getInstance MD5           digest update s getBytes             return digest digest          catch  NoSuchAlgorithmException e               never happens         e printStackTrace            return null           public static String toHex byte   buf        char   hexChars   new char buf length   2       int v      for  int i   0  i  lt  buf length  i              v   buf i   amp  0xFF          hexChars i   2    HEX ARRAY v  gt  gt  gt  4           hexChars i   2   1    HEX ARRAY v  amp  0x0F             return new String hexChars

[android] MD5 hashing in Android

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